I don't know what it is, but...
It is interesting that the light is green. Green is usually used to show life, vibrancy, and growth; the barrow is quite the opposite, dead and decaying. It provides an interesting contrast - another example of evil twisting around good to make it eerie and foul. Even the light itself - usually another symbol of good - is convoluted. It is a 'cold glow' and causes the precious treasures illumined by it to seem 'cold and unlovely'. Later, when Tom opens up the Barrow, the light that streams in is 'real light.'
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